Senior Frontend Engineer

Merciv; New York (NY); On-site; USD 150,000 - 200,000; Full time

Benefits offered by this job

Health

Dental

Vision

Life

Commuter

Job summary

A technology startup in New York is seeking a Senior Frontend Engineer to craft exceptional user experiences through advanced React components. This role involves owning frontend architecture, collaborating with cross-functional teams to optimize performance and user-centric design. Candidates should have extensive experience in frontend development and a passion for data visualization. Competitive salary ranging from $150,000 to $200,000 is offered alongside equity participation and comprehensive benefits.

Qualifications

• 6‑10+ years of professional frontend development experience.
• 4+ years building complex, production web applications with modern JavaScript frameworks.
• 2+ years with React in production environments.

Responsibilities

• Design and implement elegant, high‑performance React components.
• Architect frontend systems for scale.
• Establish coding standards and mentor team members.

Skills

Frontend Development

React

JavaScript

User Experience Design

Data Visualization

Tools

Jest

Webpack

Git

Job description

About Merciv

Merciv is an AI and data analytics startup dedicated to reshaping how businesses approach strategic intelligence. The mission is to transform how organizations harness data, generate insights, and drive strategic decisions through cutting‑edge AI pipelines and dynamic forecasting mechanisms.

About The Team

We’re building an agentic AI platform that changes how enterprises work with data. Merc connects an organization’s entire data landscape with external sources—social media trends, industry reports, consumer behavior signals—to surface insights and automate workflows that used to take analysts weeks.

We care a lot about making powerful tools feel simple—every feature intuitive and interactive. Every feature should make users feel they can do more than before. Our lean, agile team thrives on innovation and autonomy. We use a DRI (Directly Responsible Individual) model: you’ll own major product features from conception to launch, not just contribute to them. You’ll wear multiple hats, and that’s by design.

Our work environment thrives on creativity and cutting‑edge technology, built for those eager to shape the future of human‑AI collaboration.

The Role

Merciv is transforming how brands understand consumers through autonomous AI that doesn’t just analyze data—it proactively surfaces insights that drive million‑dollar decisions. Our platform powers some of the largest retail and consumer goods organizations in the world, synthesizing signals from thousands of sources to reveal patterns and opportunities before competitors see them.

As we scale our enterprise platform and launch our self‑serve tier, we need a Senior Frontend Engineer who builds exceptional user experiences that make complex AI‑powered insights feel intuitive and actionable.

You’ll own critical parts of our frontend architecture, building the UI that enables users to explore millions of data points, understand nuanced consumer sentiment, and make confident decisions backed by AI reasoning.

What You’ll Do

• Build Exceptional User Experiences: Design and implement elegant, high‑performance React components that make complex AI insights feel simple and actionable.
• Architect for Scale: Own critical parts of our frontend architecture as we grow from hundreds to thousands of daily active users across Fortune 500 enterprises.
• Collaborate Cross‑Functionally: Partner with product managers, designers, and AI engineers to translate sophisticated analytical outputs into intuitive visualizations and workflows.
• Drive Frontend Excellence: Establish coding standards, conduct rigorous code reviews, and mentor team members on modern frontend best practices.
• Optimize Performance: Ensure sub‑second load times and smooth interactions even when rendering complex data visualizations and real‑time updates.
• Champion User‑Centric Design: Work closely with UX/UI designers to implement pixel‑perfect designs while advocating for usability and accessibility.
• Own Feature Development: Take features from concept to production, including requirements gathering, technical design, implementation, testing, and deployment.
• Enable AI Interaction: Build innovative interfaces for users to interact with agentic AI systems, including natural language inputs, conversational flows, and transparent reasoning displays.
• Ensure Quality & Reliability: Write comprehensive tests, debug across browsers and devices, and maintain high code quality standards for enterprise customers.
• Shape Product Direction: Contribute to product strategy discussions, bringing frontend expertise to inform what we build and how we build it.

Core Requirements

Experience

• 6‑10+ years of professional frontend development experience
• 4+ years building complex, production web applications with modern JavaScript frameworks
• 2+ years with React in production environments
• Experience working in fast‑paced startup or high‑growth product environments
• Track record of owning significant frontend features end‑to‑end

Frontend Fundamentals

• Expert‑level knowledge of HTML5, CSS3, and modern JavaScript (ES6+)
• Deep understanding of TypeScript and type‑safe development practices
• Strong command of responsive design principles and cross‑browser compatibility
• Expertise in web performance optimization techniques (lazy loading, code splitting, caching)

React Ecosystem

• Advanced React proficiency including hooks, context, and component lifecycle
• Experience with state management solutions (Redux, Zustand, or similar)
• Knowledge of React ecosystem tools (React Router, React Query, etc.)
• Understanding of React performance optimization and rendering patterns

Modern Development Practices

• Strong expertise in modern CSS approaches (CSS Modules, Styled Components, Tailwind, or similar)
• Proficient with build tools and bundlers (Vite, Webpack, or similar)
• Experience with version control (Git) and collaborative development workflows
• Familiarity with CI/CD pipelines and automated testing frameworks

API Integration & Data Handling

• Experience integrating RESTful APIs and GraphQL endpoints
• Understanding of asynchronous JavaScript and promise‑based workflows
• Ability to handle complex data transformations and state management
• Experience with WebSocket or real‑time data streaming

Testing & Quality

• Proficiency with testing frameworks (Jest, React Testing Library, Cypress, or similar)
• Experience writing unit, integration, and end‑to‑end tests
• Understanding of test‑driven development practices
• Strong debugging skills across browsers and devices

Data Visualization

• Experience building interactive data visualizations (D3.js, Recharts, Chart.js, or similar)
• Ability to translate complex datasets into clear, compelling visual stories
• Understanding of visualization best practices and accessibility

Professional Qualities

• Ownership Mentality
• Product Thinking
• Clear Communicator
• Collaborative Spirit
• Detail‑Oriented
• User Advocate
• Strategic Thinker
• Growth Mindset
• Pragmatic Problem Solver
• Quality Champion

Nice‑to‑Have Skills

• Experience building data‑intensive or analytics‑focused applications
• Familiarity with AI/ML user interfaces or conversational UI patterns
• Background in design systems and component library development
• Experience with Next.js or other React meta‑frameworks
• Knowledge of backend technologies (Node.js, Python) for better full‑stack collaboration
• Experience with Figma or other design tools for design‑development collaboration
• Familiarity with accessibility best practices and ARIA standards
• Experience with micro‑frontend architectures or module federation
• Understanding of WebGL or advanced graphics for data visualization
• Background in consumer research, market intelligence, or retail/CPG domains
• Experience with A/B testing frameworks and feature flag systems
• Knowledge of web analytics and user behavior tracking
• Experience scaling frontend applications from early‑stage to enterprise

What We’re Looking For

• Craftsperson Mindset
• Initiative & Drive
• User Empathy
• Technical Curiosity
• Bias Toward Action
• Humility & Collaboration
• Business Awareness
• Adaptability
• Systems Thinking

The Frontend Challenge

• Complex Data Visualization: Transform millions of consumer signals into intuitive, interactive visualizations that reveal patterns and insights at a glance.
• AI Transparency: Build interfaces that make AI reasoning transparent and trustworthy, showing users exactly how conclusions were reached.
• Real‑Time Intelligence: Handle streaming updates and real‑time data while maintaining smooth, responsive user experiences.
• Information Density: Balance information density with clarity—users need comprehensive insights without cognitive overload.
• Diverse User Personas: Design for everyone from Fortune 500 executives needing high‑level summaries to analysts requiring deep‑dive capabilities.
• Performance at Scale: Ensure instant load times and smooth interactions even with complex datasets and visualizations.
• Enterprise Standards: Meet accessibility (WCAG), security, and compliance requirements expected by Fortune 500 customers.
• Rapid Innovation: Ship new features quickly while maintaining code quality and user experience consistency.

Why Join Us?

• Revolutionary Impact: Build the interface for AI that’s transforming how Fortune 500 brands understand and respond to their consumers.
• Cutting‑Edge Technology: Work with modern frontend stack, AI‑powered features, and complex data visualization challenges.
• Enterprise Trust: Your work enables major brands to make million‑dollar decisions with confidence.
• Rapid Growth: Join us as we scale from startup to category leader, with equity participation in our success.
• Product Influence: Directly shape product direction and user experience—your ideas matter from day one.
• Technical Excellence: Collaborate with world‑class engineers and AI researchers building the future of consumer intelligence.
• Ownership & Equity: Significant equity participation in a company transforming a $30 trillion retail industry.
• Innovation Freedom: Experiment with new technologies and approaches; we encourage calculated risk‑taking.
• Customer Impact: See your work directly impact how major brands like Gap, Old Navy, and Athleta serve their customers.
• Professional Growth: Budget for conferences, courses, and staying at the forefront of frontend engineering.
• Creative Environment: Work in a culture that values both technical excellence and thoughtful design.
• Flexible & Autonomous: We trust you to do great work without micromanagement.

Compensation

Compensation Range: $150,000 – $200,000

Equity: Equity grant as an early team member

Benefits

• Health
• Dental
• Vision
• Life
• Commuter

Interview Process

• Initial screening call (30 minutes) – Get to know each other and discuss your background
• Technical deep dive (60–90 minutes) – Live coding session and system design discussion focused on frontend architecture
• Product & design collaboration (60 minutes) – Work through product scenarios with our product and design teams
• Team collaboration session (preferably in‑person) – Meet the team, pair program, and see our office
• Culture & vision discussion with leadership – Ensure mutual alignment on values and direction

Merciv is building the future of consumer intelligence. We’re committed to assembling a diverse team of builders who want to revolutionize how brands understand and serve their customers. We are an equal‑opportunity employer, and we do not discriminate on the basis of race, religion, color, national origin, sex, sexual orientation, age, veteran status, disability, genetic information, or other applicable legally protected characteristic.